add http lock implementation

sync/lock/http/server/server.go

@@ -0,0 +1,45 @@
+// Package server implements the sync http server
+package server
+
+import (
+	"net/http"
+
+	"github.com/micro/go-micro/sync/lock"
+	lkhttp "github.com/micro/go-micro/sync/lock/http"
+)
+
+func Handler(lk lock.Lock) http.Handler {
+	mux := http.NewServeMux()
+
+	mux.HandleFunc(lkhttp.DefaultPath, func(w http.ResponseWriter, r *http.Request) {
+		r.ParseForm()
+
+		id := r.Form.Get("id")
+		if len(id) == 0 {
+			return
+		}
+
+		switch r.Method {
+		case "POST":
+			err := lk.Acquire(id)
+			if err != nil {
+				http.Error(w, err.Error(), 500)
+			}
+		case "DELETE":
+			err := lk.Release(id)
+			if err != nil {
+				http.Error(w, err.Error(), 500)
+			}
+		}
+	})
+
+	return mux
+}
+
+func Server(lk lock.Lock) *http.Server {
+	server := &http.Server{
+		Addr:    lkhttp.DefaultAddress,
+		Handler: Handler(lk),
+	}
+	return server
+}